Earlier quoted context omitted.
Mediums are themselves services that a consumer decides whether to use based on marginal cost and utility. They are services that are used to purchase products and services. Purchase decisions are made about these services in the same manner as purchase decisions about the end product, at least under the rational choice theory of economics.
So under that theory, the medium of Ethereum will increasingly not be chosen.
Of course. Once it becomes too expensive because too many people are choosing to use it, then nobody will choose to use it.
At that point, nobody will go there anymore because it's too crowded.